/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef included_clib_cpu_h #define included_clib_cpu_h #include <vppinfra/format.h> /* * multiarchitecture support. Adding new entry will produce * new graph node function variant optimized for specific cpu * microarchitecture. * Order is important for runtime selection, as 1st match wins... */ #if __x86_64__ && CLIB_DEBUG == 0 #define foreach_march_variant(macro, x) \ macro(avx2, x, "arch=core-avx2") #else #define foreach_march_variant(macro, x) #endif #if __GNUC__ > 4 && !__clang__ #define CLIB_CPU_OPTIMIZED __attribute__ ((optimize ("O3"))) #else #define CLIB_CPU_OPTIMIZED #endif #define CLIB_MULTIARCH_ARCH_CHECK(arch, fn, tgt) \ if (clib_cpu_supports_ ## arch()) \ return & fn ## _ ##arch; #define CLIB_MULTIARCH_SELECT_FN(fn,...) \ __VA_ARGS__ void * fn ## _multiarch_select(void) \ { \ foreach_march_variant(CLIB_MULTIARCH_ARCH_CHECK, fn) \ return & fn; \ } #ifdef CLIB_MARCH_VARIANT #define __CLIB_MULTIARCH_FN(a,b) a##_##b #define _CLIB_MULTIARCH_FN(a,b) __CLIB_MULTIARCH_FN(a,b) #define CLIB_MULTIARCH_FN(fn) _CLIB_MULTIARCH_FN(fn,CLIB_MARCH_VARIANT) #else #define CLIB_MULTIARCH_FN(fn) fn #endif #define CLIB_MARCH_SFX CLIB_MULTIARCH_FN #define foreach_x86_64_flags \ _ (sse3, 1, ecx, 0) \ _ (ssse3, 1, ecx, 9) \ _ (sse41, 1, ecx, 19) \ _ (sse42, 1, ecx, 20) \ _ (avx, 1, ecx, 28) \ _ (avx2, 7, ebx, 5) \ _ (avx512f, 7, ebx, 16) \ _ (x86_aes, 1, ecx, 25) \ _ (sha, 7, ebx, 29) \ _ (invariant_tsc, 0x80000007, edx, 8) #define foreach_aarch64_flags \ _ (fp, 0) \ _ (asimd, 1) \ _ (evtstrm, 2) \ _ (aarch64_aes, 3) \ _ (pmull, 4) \ _ (sha1, 5) \ _ (sha2, 6) \ _ (crc32, 7) \ _ (atomics, 8) \ _ (fphp, 9) \ _ (asimdhp, 10) \ _ (cpuid, 11) \ _ (asimdrdm, 12) \ _ (jscvt, 13) \ _ (fcma, 14) \ _ (lrcpc, 15) \ _ (dcpop, 16) \ _ (sha3, 17) \ _ (sm3, 18) \ _ (sm4, 19) \ _ (asimddp, 20) \ _ (sha512, 21) \ _ (sve, 22) #if defined(__x86_64__) #include "cpuid.h" static inline int clib_get_cpuid (const u32 lev, u32 * eax, u32 * ebx, u32 * ecx, u32 * edx) { if ((u32) __get_cpuid_max (0x80000000 & lev, 0) < lev) return 0; if (lev == 7) __cpuid_count (lev, 0, *eax, *ebx, *ecx, *edx); else __cpuid (lev, *eax, *ebx, *ecx, *edx); return 1; } #define _(flag, func, reg, bit) \ static inline int \ clib_cpu_supports_ ## flag() \ { \ u32 __attribute__((unused)) eax, ebx = 0, ecx = 0, edx = 0; \ clib_get_cpuid (func, &eax, &ebx, &ecx, &edx); \ \ return ((reg & (1 << bit)) != 0); \ } foreach_x86_64_flags #undef _ #else /* __x86_64__ */ #define _(flag, func, reg, bit) \ static inline int clib_cpu_supports_ ## flag() { return 0; } foreach_x86_64_flags #undef _ #endif /* __x86_64__ */ #if defined(__aarch64__) #include <sys/auxv.h> #define _(flag, bit) \ static inline int \ clib_cpu_supports_ ## flag() \ { \ unsigned long hwcap = getauxval(AT_HWCAP); \ return (hwcap & (1 << bit)); \ } foreach_aarch64_flags #undef _ #else /* ! __x86_64__ && !__aarch64__ */ #define _(flag, bit) \ static inline int clib_cpu_supports_ ## flag() { return 0; } foreach_aarch64_flags #undef _ #endif /* __x86_64__, __aarch64__ */ /* * aes is the only feature with the same name in both flag lists * handle this by prefixing it with the arch name, and handling it * with the custom function below */ static inline int clib_cpu_supports_aes () { #if defined (__aarch64__) return clib_cpu_supports_x86_aes (); #elif defined (__aarch64__) return clib_cpu_supports_aarch64_aes (); #else return 0; #endif } static inline int clib_cpu_march_priority_avx512 () { if (clib_cpu_supports_avx512f ()) return 20; return -1; } static inline int clib_cpu_march_priority_avx2 () { if (clib_cpu_supports_avx2 ()) return 10; return -1; } static inline u32 clib_cpu_implementer () { char buf[128]; static u32 implementer = -1; if (-1 != implementer) return implementer; FILE *fp = fopen ("/proc/cpuinfo", "r"); if (!fp) return implementer; while (!feof (fp)) { if (!fgets (buf, sizeof (buf), fp)) break; buf[127] = '\0'; if (strstr (buf, "CPU implementer")) implementer = (u32) strtol (memchr (buf, ':', 128) + 2, NULL, 0); if (-1 != implementer) break; } fclose (fp); return implementer; } static inline u32 clib_cpu_part () { char buf[128]; static u32 part = -1; if (-1 != part) return part; FILE *fp = fopen ("/proc/cpuinfo", "r"); if (!fp) return part; while (!feof (fp)) { if (!fgets (buf, sizeof (buf), fp)) break; buf[127] = '\0'; if (strstr (buf, "CPU part")) part = (u32) strtol (memchr (buf, ':', 128) + 2, NULL, 0); if (-1 != part) break; } fclose (fp); return part; } #define AARCH64_CPU_IMPLEMENTER_THUNERDERX2 0x43 #define AARCH64_CPU_PART_THUNERDERX2 0x0af #define AARCH64_CPU_IMPLEMENTER_QDF24XX 0x51 #define AARCH64_CPU_PART_QDF24XX 0xc00 #define AARCH64_CPU_IMPLEMENTER_CORTEXA72 0x41 #define AARCH64_CPU_PART_CORTEXA72 0xd08 static inline int clib_cpu_march_priority_thunderx2t99 () { if ((AARCH64_CPU_IMPLEMENTER_THUNERDERX2 == clib_cpu_implementer ()) && (AARCH64_CPU_PART_THUNERDERX2 == clib_cpu_part ())) return 20; return -1; } static inline int clib_cpu_march_priority_qdf24xx () { if ((AARCH64_CPU_IMPLEMENTER_QDF24XX == clib_cpu_implementer ()) && (AARCH64_CPU_PART_QDF24XX == clib_cpu_part ())) return 20; return -1; } static inline int clib_cpu_march_priority_cortexa72 () { if ((AARCH64_CPU_IMPLEMENTER_CORTEXA72 == clib_cpu_implementer ()) && (AARCH64_CPU_PART_CORTEXA72 == clib_cpu_part ())) return 10; return -1; } #ifdef CLIB_MARCH_VARIANT #define CLIB_MARCH_FN_PRIORITY() CLIB_MARCH_SFX(clib_cpu_march_priority)() #else #define CLIB_MARCH_FN_PRIORITY() 0 #endif #endif /* included_clib_cpu_h */ #define CLIB_MARCH_FN_CONSTRUCTOR(fn) \ static void __clib_constructor \ CLIB_MARCH_SFX(fn ## _march_constructor) (void) \ { \ if (CLIB_MARCH_FN_PRIORITY() > fn ## _selected_priority) \ { \ fn ## _selected = & CLIB_MARCH_SFX (fn ## _ma); \ fn ## _selected_priority = CLIB_MARCH_FN_PRIORITY(); \ } \ } \ #ifndef CLIB_MARCH_VARIANT #define CLIB_MARCH_FN(fn, rtype, _args...) \ static rtype CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (fn ## _ma)(_args); \ rtype (*fn ## _selected) (_args) = & CLIB_MARCH_SFX (fn ## _ma); \ int fn ## _selected_priority = 0; \ static inline rtype CLIB_CPU_OPTIMIZED \ CLIB_MARCH_SFX (fn ## _ma)(_args) #else #define CLIB_MARCH_FN(fn, rtype, _args...) \ static rtype CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (fn ## _ma)(_args); \ extern int (*fn ## _selected) (_args); \ extern int fn ## _selected_priority; \ CLIB_MARCH_FN_CONSTRUCTOR (fn) \ static rtype CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (fn ## _ma)(_args) #endif #define CLIB_MARCH_FN_SELECT(fn) (* fn ## _selected) format_function_t format_cpu_uarch; format_function_t format_cpu_model_name; format_function_t format_cpu_flags; /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */